Spill proof cup lid



FIG. 1 is a perspective view of a spill proof cup lid according to the present invention;

FIG. 2 is a first side view of a spill proof cup lid of FIG. 1, the opposite side being identical thereto;

FIG. 3 is a front view of the spill proof cup lid of FIG. 1;

FIG. 4 is a rear view of the spill proof cup lid of FIG. 1;

FIG. 5 is a top view of the spill proof cup lid of FIG. 1; and,

FIG. 6 is a bottom view of the spill proof cup lid of FIG. 1. 

The ornamental design for the spill proof cup lid, as shown and described in the accompanying figures. 